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Ring type:
Ring by order: Each time starting from the line 1 and sequentially looking unoccupied line for
ring
Round Robin: Turn calls increased each cycle, ringing every user
4.1.2 SIP Advance Setting
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SIP port number: Local SIP port number setting defaults: 5060
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Media Port Start:
The starting range of RTP port. Port number for initial of sending RTP
packet, default setting is 9000.
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RTP Packetization interval (Ptime), default is 20 ms
Value less: Increase network load and improve the sound quality